Director Alis Locanta’s “Back Home 2” is a sequel, by definition, but it diverges from the original film in ways both significant and subtle. The most immediately obvious difference is that “Back Home” was a lesbian love story, and the follow-up involves a woman and a man. But apart from the differences in plumbing, “Back Home 2” is a cheerful, upbeat “two hearts story” (the sequel’s subtitle), while there was an undercurrent of heartbreak, emotional hurt, and romantic fragility in the original. A motorcycle speeds along a mountain road. Meanwhile, Alexa Tomas is happily at work tidying up her home. She then steps outside and takes a seat on the curb to wait in eager anticipation. The motorcyclist rides up, dismounts, and removes his helmet — after an unexplained absence Juan Lucho has returned to his home and the welcoming embrace of his lover. After rinsing off the miles during a brief shower Lucho joins Tomas in the kitchen.